How much does it cost to deal with the trunk is cracked / the tree split down the middle?

The pricing fork is save versus remove. Reduction plus cabling is priced as skilled climbing pruning plus hardware and a return inspection. Removal of a split tree costs more than removing a sound tree of identical size, because no climber will work a compromised stem — it forces a bucket or crane. Photograph the crack from the ground for the estimate; do not put a ladder against a cracked trunk to get a better picture.